Nested square root of continued fraction references

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$$\sqrt {a_0 + \cfrac{b_1}{\sqrt{a_1 + \cfrac{b_2}{\sqrt{a_2 + \cfrac{b_3}{ \ddots }}}}}}$$ Are there any texts that explain how to deal with expressions like this?

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Are there any texts that explain how to deal with expressions like this ?

Yes. Notice that continued fractions are themselves nested radicals or order $-1$. (See link for more details). So what you have there is a nested radical of order $-2$.